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Mapping the Forgotten Colony: The Ogasawara Islands and the Tokugawa Pivot to the Pacific
요나스 뤼그 고려대학교 민족문화연구원 2017 Cross-Currents Vol.- No.23
In 1862, Japan’s Tokugawa shogunate claimed the Ogasawara Islands, a small archipelago between Honshu and Guam, as a part of Japan. In the manageable setting of the islands, the shogunate undertook a colonial experiment that revealed changing attitudes toward non-Japanese ethnicities, modern technologies, and maritime space. Through an examination of four maps, this article shows that Japanese intellectuals had been discussing plans for settler colonialism in the Pacific almost a century before Tokugawa leaders began exploring the open sea as an economic space. In the shogunate’s two-tiered strategy, agriculture assimilated the land, and law subjected its earlier settlers. This approach provided a foothold for offshore whaling, which transformed the surrounding seas into a space of production. However, expanding the sphere of Tokugawa influence necessitated a redefinition of the Japanese realm. Geographical notions were reshaped to make the overseas territory a part of the Izu archipelago some 700 kilometers farther north, and the presence of Western settlers was countered with narratives of earlier possession and relocation of Japanese individuals. Officials were particularly intrigued by formerly unknown plant and animal species found on the islands. Exploring economic opportunities in the Pacific sphere, they prepared a geopolitical shift that is often associated with Japan’s modern empire. This article, by contrast, locates the origins of modern Japan’s “pelagic empire” well before the Meiji Reform and shows how expansionism was reconciled with earlier perceptions of geography.
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전기장분무증착을 이용한 계면 접촉 면적 확장을 통한 고체산화물연료전지 성능 개선
유현식,김서주,요나스,이종서,석지원,이원영 대한기계학회 2023 大韓機械學會論文集B Vol.47 No.12
고체산화물연료전지에서 공기극과 전해질 사이 계면은 전기화학성능을 결정짓는 매우 중요한 요소이다. 특히, 계면에서의 공기극과 전해질의 접촉면적을 늘리는 것이 중요한데 본 연구에서는 전기장분무증착 공정을 이용하여 기존 스크린프린팅 공정대비 공기극 입자크기를 더 작고 균일하게 증착하여 계면에서의 접촉면적을 확장시켰다. 기계적 인장 실험을 통해 개선된 계면에서의 구조적, 물리적 특성을 직접적으로 분석하였으며 전기화학성능평가를 통해 구조적 특성과의 상관관계를 입증하였다. 전기장분무증착 공정을 이용해 증착한 공기극은 Ni-Gd0.1Ce0.9O1.95기반의 단전지에서 스크린프린팅 공정대비 600°C에서 약 1.7배 향상한 1.9 W/cm2의 높은 최대전력밀도를 보였다. In solid oxide fuel cells, the interface between the cathode and the electrolyte is an important factor determining the electrochemical performance, particularly increasing the contact area at the interface. In this study, the contact area at the interface was expanded by depositing smaller and more uniform cathode particles using the electrostatic spray deposition (ESD) process compared with the conventional screen printing (SP) process. The structural and physical properties of the improved interface were directly analyzed through the mechanical tensile strength test, and the correlation with the electrochemical properties was demonstrated through the electrochemical analysis. The cathode deposited using the ESD process showed a high peak power density of 1.9 W/cm2 at 600 °C that was approximately 1.7 times higher than that of the SP process in a Ni-Gd0.1Ce0.9O1.95-based single cell.
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Toxicity testing of wastewater and inter-laboratory comparison based on Lemna minor root elongation
Jihae Park(박지혜),Eun-Jin Yoo(유은진),Kisik Shin(신기식),Soyeon Choi(최소연),Hojun Lee(이호준),Geonhee Kim(김건희),Stephen Depuydt(스테픈 데퓨잇),Jonas De Sager(요나스 데 세거),Taejun Han(한태준) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
The Lemna minor root regrowth test method is a toxicity test performed with very simple equipment and only one L. minor plant (two- to three-frond) in each culture well, cutting the roots before exposure and measuring the regrowth of the newly developed roots after three days. As a substrate for laboratory toxicity assays, L. minor has the advantages of small size, structural simplicity and rapid growth. Compared to the three internationally standardized methods, this bioassay is faster, simpler, more convenient and cheaper. It can be applied to a variety of sample types, including (a) individual chemicals, commercial products or known mixtures of chemicals, (b) industrial or urban freshwater effluents, elutriates or leachates and (c) surface freshwater or receiving waters. The test can be used alone or as part of a test battery to determine and monitor the toxic effects of individual substances or complex mixtures that may be harmful to aquatic life in freshwater ecosystems, and as a weight-of-evidence approach to determine the need for controlling discharges and setting effluent standards.
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